Fractal Superconducting Nanowire Avalanche Photodetectors with 84% System Efficiency at 1600 nm, 1.02 Polarization Sensitivity, and 29 ps Timing Resolution

We demonstrate a fractal superconducting nanowire single-photon detector with 84% system efficiency at 1600 nm, 1.02 polarization sensitivity, and 29 ps timing resolution, which have never been simultaneously achieved before.